GRK’s R4™ self-countersinking screw has a patented underhead with sawblade like cutting teeth and six self-contained cutting pockets. Together they act similar to a circular sawblade, transporting the drill dust away from the edge of the screw hole while cutting a perfectly clean hole into even the most brittle materials without cracking any surface treatment.
• Zero stripping with 6 points of contact
• Enlarges hole to reduce splitting
• Low torque, smoother drive, reduced splitting
• No pre-drilling, faster penetration
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101 Trillium Dr
Kitchener, Ontario N2E 1W8
Kitchener, Ontario N2E 1W8
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Mon–Fri 9 AM–5 PM • Sat 9 AM–1 PM
